Buggy code:
public class SelectionRequestor implements ISelectionRequestor { protected NameLookup nameLookup ; protected Openable openable ; protected IJavaElement [ ] elements = JavaElement . NO_ELEMENTS ; protected int elementIndex = - 1 ; protected HandleFactory handleFactory = new HandleFactory ( ) ; public SelectionRequestor ( NameLookup nameLookup , Openable openable ) { } protected void acceptBinaryMethod ( IType type , char [ ] selector , char [ ] [ ] parameterPackageNames , char [ ] [ ] parameterTypeNames , String [ ] paramterSignatures ) { } public void acceptClass ( char [ ] packageName , char [ ] className , boolean needQualification , boolean isDeclaration , int start , int end ) { } public void acceptError ( IProblem error ) { } public void acceptField ( char [ ] declaringTypePackageName , char [ ] declaringTypeName , char [ ] name , boolean isDeclaration , int start , int end ) { } public void acceptInterface ( char [ ] packageName , char [ ] interfaceName , boolean needQualification , boolean isDeclaration , int start , int end ) { } public void acceptLocalField ( SourceTypeBinding typeBinding , char [ ] name , CompilationUnitDeclaration parsedUnit ) { } public void acceptLocalMethod ( SourceTypeBinding typeBinding , char [ ] selector , char [ ] [ ] parameterPackageNames , char [ ] [ ] parameterTypeNames , String [ ] parameterSignatures , boolean isConstructor , CompilationUnitDeclaration parsedUnit , boolean isDeclaration , int start , int end ) { IType type = ( ( IType ) ( this . handleFactory . createElement ( typeBinding . scope . referenceContext , parsedUnit , this . openable ) ) ) ; if ( type != null ) { if ( type . isBinary ( ) ) { IType declaringDeclaringType = type . getDeclaringType ( ) ; boolean isStatic = false ; try { isStatic = Flags . isStatic ( type . getFlags ( ) ) ; } catch ( JavaModelException e ) { } if ( ( ( declaringDeclaringType != null ) && isConstructor ) && ( ! isStatic ) ) { int length = parameterPackageNames . length ; System . arraycopy ( parameterPackageNames , 0 , ( parameterPackageNames = new char [ length + 1 ] [ ] ) , 1 , length ) ; System . arraycopy ( parameterTypeNames , 0 , ( parameterTypeNames = new char [ length + 1 ] [ ] ) , 1 , length ) ; System . arraycopy ( parameterSignatures , 0 , ( parameterSignatures = new String [ length + 1 ] ) , 1 , length ) ; parameterPackageNames [ 0 ] = declaringDeclaringType . getPackageFragment ( ) . getElementName ( ) . toCharArray ( ) ; parameterTypeNames [ 0 ] = declaringDeclaringType . getTypeQualifiedName ( ) . toCharArray ( ) ; <START_BUG> parameterSignatures [ 0 ] = Engine . getSignature ( typeBinding . enclosingType ( ) ) ; <END_BUG> } acceptBinaryMethod ( type , selector , parameterPackageNames , parameterTypeNames , parameterSignatures ) ; } else { acceptSourceMethod ( type , selector , parameterPackageNames , parameterTypeNames ) ; } } } public void acceptLocalType ( SourceTypeBinding typeBinding , CompilationUnitDeclaration parsedUnit ) { } public void acceptLocalVariable ( LocalVariableBinding binding , CompilationUnitDeclaration parsedUnit ) { } public void acceptMethod ( char [ ] declaringTypePackageName , char [ ] declaringTypeName , String enclosingDeclaringTypeSignature , char [ ] selector , char [ ] [ ] parameterPackageNames , char [ ] [ ] parameterTypeNames , String [ ] parameterSignatures , boolean isConstructor , boolean isDeclaration , int start , int end ) { } public void acceptPackage ( char [ ] packageName ) { } protected void acceptSourceMethod ( IType type , char [ ] selector , char [ ] [ ] parameterPackageNames , char [ ] [ ] parameterTypeNames ) { } protected void acceptMethodDeclaration ( IType type , char [ ] selector , int start , int end ) { } protected void acceptType ( char [ ] packageName , char [ ] typeName , int acceptFlags , boolean needQualification , boolean isDeclaration , int start , int end ) { } public void acceptTypeParameter ( char [ ] declaringTypePackageName , char [ ] declaringTypeName , char [ ] typeParameterName , boolean isDeclaration , int start , int end ) { } public void acceptMethodTypeParameter ( char [ ] declaringTypePackageName , char [ ] declaringTypeName , char [ ] selector , int selectorStart , int selectorEnd , char [ ] typeParameterName , boolean isDeclaration , int start , int end ) { } protected void addElement ( IJavaElement element ) { } public IJavaElement [ ] getElements ( ) { } protected IType resolveType ( char [ ] packageName , char [ ] typeName , int acceptFlags ) { } protected IType resolveTypeByLocation ( char [ ] packageName , char [ ] typeName , int acceptFlags , int start , int end ) { } }

Fix:
parameterSignatures [ 0 ] = new String ( Engine . getSignature ( typeBinding . enclosingType ( ) ) ) ;